Support
Have a question, running into something, or want to report an issue? We’re happy to help. Below you’ll find answers to the most common questions and how to reach us.
Contact
Frequently asked questions
Is my financial data safe?
Yes. All your data is stored locally on your device. Sub37 Labs does not operate a server that stores your data and has no access to your numbers. If you enable iCloud sync, your data is encrypted and stored in your personal iCloud account. More details are available in our
privacy policy.
Can I try ZumFlo for free?
Yes. After downloading, you get 14 days of free access to all features. No account or credit card required to get started. After the trial, you choose whether to continue with ZumFlo Standard or Pro.
How do I cancel my subscription?
Your subscription is managed through your Apple ID. Go to iOS Settings → your name → Subscriptions → ZumFlo. There you can cancel or switch plans. After cancellation, you keep access until the end of the current period. Your data stays on your device and is not deleted.
What’s the difference between Standard and Pro?
Both plans offer the full daily calculation, insights, and PIN integration. Pro adds accounting integration with Moneybird, advanced exports for your accountant, multilingual reports, and unlimited work locations. Standard supports up to 2 locations.
Does ZumFlo work without SumUp or Moneybird?
Yes. ZumFlo works fully standalone. The integrations with SumUp, Zettle, and Moneybird are optional and designed to reduce manual entry. Without a connection, you enter amounts yourself — the result is the same.
Can I use ZumFlo on multiple devices?
Yes, if you enable iCloud sync. Your data is then automatically synchronised between your iPhone and other Apple devices with the same Apple ID.
I found a bug or have a suggestion. Where can I report it?
Send an email to
with a description of what you see and what you expected. Include your app version (found in My Business → Settings → About ZumFlo). Screenshots help us understand faster.